Game-board.



No. 663,336. Patented Dec. 4, |900. A. C. FULD.

GAME BOARD.

1i n led Apr. 13, 1900) (No Nudel.)

Y 27W@ i??? @n/@60863 w VUNrrnn STATES. Pnrnirr ANNIE CARRIE FULD, OF BALTIMORE, MARYLAND.

GAME-BOARD.

SPECIFICATION forming part of Letters Patent No. 663,336, dated December 4, 1900.

Application ined Api-i1 is, 1900.

T0 all wtont t ntcty concern/.f

Beit known that I, ANNIE CARRIE FULD, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented new and useful Improvements in Game- Boards, of which the following is a specification.

My invention relates to game-boards, and has for its object to provide an improved game-board which will combine instruction with amusement.

By the use of my improved board the fundamental operations of arithmetic can be readily and accurately performed. Its operation is so simple and fascinating that any child can quickly master it and will become interested therein and be both instructed and amused by using it.

In the drawings which accom pany this specification, and of which they form a part, Figure lis a plan view of my gaine-board. Fig. 2 is a longitudinal section of the same.

Fig. 3 is a plan view of the number-disk.

In the drawings like characters of reference denote like parts wherever they occur.

My game-board consists of the combination of a board A, a shaft G, journaled in said board, two horizontal disks B and C, and a hand-wheel D, all keyed to said shaft. Disk B is placed under the board, and the wheel D and the disk C are above.

Board A is provided with a series of numbers E from l to 9, inclusive, arranged in a curve partially surrounding the hand or operating wheel. Holes F' F2 Fs are cut in the board at points outside of the hand-wheel to serve as windows through which numbers ou the disk B can be seen, as will be hereinafter more fully described.

The disk C, keyed on shaft Gr, is an indicater to be used in connection with numbers of series E. The operating-wheel D, keyed to shaft Gr at its upper end, is fitted with spokes I, extending through the rim J, said spokes being surmounted with neatly-turned knobs for use as handles in operating the de vice. Printed on rim J is a series of num bers K, these numbers being so arranged that with the exception of the first and last the contiguous ones differ by one unit and increase uniformly in one direction. Any numbers fulfilling both of these conditions can serial Ilo. 12.707y lllo model.;

be used; but some of the advantages of my device may be obtained by using any numbers at all.

Disk C, placed behind board A and keyed to shaft G, is provided with three series of concentrically-arranged numbers L' L2 L2, which show through perforations F F2 F2, which are so placed that the numbers of a series correspond to a hole, and as the numberdisk C is revolved on its axis the numbers of each series will appear simultaneously. This is accomplished by the spacing of the numbers. That numbers are placed on the disk C will be apparent from the description of the operation of the device.

The operation of my game-board is as follows: Having a series of numbers on operating-wheel D so arranged that they increase uniformly in one direction by one unit, the numbers being placed so there is one over each spoke, I turn the hand-wheel till one of the numbers of this series K is opposite one of the holes F2, and any number at all may be printed on the disk to show through this hole. I shall denote the numbers showing through the perforations F F2 F3 by F/ F2 F, respectively. The product of the number K and F2 is now shown through hole F2, and the product of F2 by the number next below on the wheel will show through F', and the sum of F and F2 will also be equal to F3. This may be easily sh-own by the following simple algebraic proof: Calling the number on the wheel opposite the hole F2, K, and the number next below it, K-I, we have F2 K/:FS and (KL-l) F2:F/. Eliminating K', we have F-lF2--F2.

If I use an arbitrary series of numbers on my operating wheel, the number showing through F will be equal to F3*F2. The method of filling out the numbers on the number-disk B has now been indicated, and while it is my intention to manufacture my boards with numbers on them I do not wish to be limited to any particular series of numbers.

rlhe numbers in series E and the indicatordisk are to be used in the following game and have nothing to do with the foregoing. An operator moves the indicator C so that it designates one of the numbers of series E and then requests a second person, who has been IOO and add them up and tell him the sum. Having the sum, he readily determines the missing number by dividing the sum by nine. The remainder, after the division subtracted from nine, discloses the omitted one.

The above scheme depends for its success on the fact that the sum of the numbers arranged in this manner is divisible by nine. Hence it one of them is omitted the sum will not be so divisible. In case no number is omitted the result would be the same as if nine had been omitted; but the person blindfolded can guard against being` fooled in this manner by rememberingv that the sum of all the numbers arranged according` to the above scheme is two thousand and seventy.

Having thus described my invention, what I claim as new, and wish to secure by Letters Patent, is-

The combination of a disk keyed to a shaft journaled in a board and bearing several concentric series of numbers, said board having a sight-opening therein for each of said series of numbers, and an operating-wheel keyed to said shaft and fitted with spokes which serve as pointers and having a series of numbers thereon corresponding to said spokes.

In testimony whereof l have hereunto set my hand in presence of two subscribing` witnesses.

ANNE OARRE FULD. .Vitnesses:

FRANK MEEHAN, CHRISTIAN DAUB. 

